Printing telegraphy



April 1'4, 1925. l H. PFANNENSTIEHL PRINTING TELEGRAPHY Filed -Ju'ly 21,. 1920 4 Sheets-Sheet 1 4 Sheets-Sheet 2 HPFANNENsTxEl-n.

' PRNTINL, TELEGRAPM Filed July v21 .l

"Apr-i114, 1925.

H. PFANNENSTIEHL PRINTING TELEGRAPHY Filed July 21, 1920.

4 Sheets-Sheet 5 Mmmm @ffy/ Apri 14, 1925. 1,533,206

H. PFANNENSTIEHL PRINTING TELEGRAEHY Harry /D/a/MeHS///l/ is provided for C@ MIPLEVJGD, NEX-I7 NCOELRATED, 0E? NEW' YORK, N. Y., CORPORATION OF terrien,

JERSEY, .iSSGNOR TO WESTERN G TELEGRAPHY.

l Application filed .l'uly 21,

To di 'mito/m, if may concern.'

Be ltr-.erm that. i'. Hsien: Permiten .Grim-n., a citizen ot the lfnited States, re: sidinget ltleplewood, in the 'cfunty ot .riss-en State o1 New Jersey, have. invented new und nsetul improvements 1n ifi-intingeelegrephy., Dif rhich the following is fuit, clear, concise, and exact de.-

Lien. ihis invention relates to printing 'teleeretus and particularly to keyting and controlling mechanism for use primarily in telegraph systems.

nyohiect of the invention is the provision of a ceninact. and unitary key controlled mechanism whereby 'response to the. actur-.tion'ot keys, character representations may he transmitted to a distant stetion by ineens or" current impulses or recorded or stored in the ormotf indentatiens or perorations in a lsnitebie rccmrdingmedium fo future trensinionion,

@ther chico of the invention tire the provision ci' Ineens whereby the simultane oun depression of tiro or more keys 1s rendered impossible; ineens whercbjfv the key actuated selecriing mechanism when once actuatedreinains in its operated position until. withdrawn by the subsequent actua tion of another key; and on improved means for restoring; he punch pins ot the periforut inf mechanism.

` lhe invention contemplates the employ- Anient oi mechanism selectively responsive tolevers tor the actuatfm ot' keys and lacy closing a 'plurality ol.' current conirollinlv fjjontacts in rai-ions conihin-.itimis according lo the character lo be. transmitted and for act-uniting a` corrcspoinling number oi criteration controlling members in various combinations for r,\cordin r the characters hy means ot' perforations in n tape. ln ziddition', there. is provided under control of each key a circuit closing member 4for controlling a. suitable distributing mechanism for distributing the current impulses to line in proper sequential order when the mechanism is used as a direct. keyboard trans` mitter and a correspondintor circuit closing member under control of each lier 'tor-cole trollingl the operation ot' a suitable perforar.- ingf mechanism when the mechanism is usci as a keyboard perforetor. Switching ineens impulse distributor or periforator under con- ,as to render placing either the 'currentwhen one or the other is shiftedl due to. the

depression of a character key, the other nwill he. moved in the opposite direction. This, will be more clearly brought out in the descrii'itionwhich is, to follow, ohriates the necessity of retracfile springs and permits the segments ot' a distributor to he direc-.tint7 connected to the Contact; springs controlled by the selecting?f hars.

mechanism in two In order to preventthe interference ot signals which wouldv necessarily follow it two keys were (lepresrxcd nt the same time, the key levers are so arranged in conjunction with apertures cnt in the selecting,` hars it impossible to depress two keys at. the ame time. I

{'hen the keyboard mechanism is used in con'j onction with e pertorator for pertoratinnr :i paper tape which is to be subsequently used in the transmission of a message, a member under the. cont-rol oit' an electromagnct. is actuated l'or positively restoringr any oi the punch pins which may have been picriously dri ren through the tape due lo the. rncn'ization ol' the clcclroinngrnct.

:l bcltcr understanding.;v oll the. invention maybe had i'rom theI following ilescriiition and claims when considered in conjunction with the accompanyin;r drawingr wherein lfig. l is a plan View representing one embodiment of theinrcntion; Fig. i2 is a front View with a port-ion of thc casing cut away; Fig. 3 is a detail taken along' the. line 3-l, Fig. l; Figi", et is an end View taltcn along the line SM5, l `ig.1;l"ig.(3 is a detail oi' u fewoi' the selecting hars, while Fig. 7 shows in schematic form'the circuit arrangement employed in connection with the keyboard mechanism.

Referring noi' to the drawings wherein lilic parts bear ters, there is provided a casing;

suitable supthe same reference charac-- es: mail ports for the 'ferions elements of both the keyboard mechanism unil the pcrforetor zindwhich will be mole clearly broughtout in the description which to follow. The arrangement or the character keys is substantially the suine that of any wellknown typewriter und inasmuch es the keys' form no part oi' the present invention, a detailed description thereof is unnecessary. ylfhe character keys are mounted on suitable key levers which are in the forni of u crank so that when :i key is depressed, e portion of the lever will. be caused to more substantially in e horizontaal plaine. lu order to permit movement oi" the key levers in this manner they are supported by ineens of extensions t3, il and l0. 'lhese extensions are secured to the housingr by menus of suitable screws, but any other menus of secur innr the seme may, of course, be employed.

'lh'e lrey levers are all of similar construction end they differ only in their length `which is necessitated in order to` properly :ii-ronge the character keys. There is essocieted with euch of the key levers, n ilexible springl member 26 which .is for the pur,- pose of restoringr the keys to normal upon their release. rrlhese springs, es, clearly shown in ere attached to an uprightl member 2i by means of screws 28.

lThe key levers associated with the ver onskeys pass through and cooperate with apertures cut in the several selecting bersl which beer the numerals 1t to 2() inclusive, there also being provided what might" be termed es two common selecting bars such as 21 and 22', the former being shifted upon the depression of certeinones of the chemo ter keys while the letter is shifted upon the depression of each of the keys. The func tion of these two lest-mentioned selecting bers will be more clearly brought ont in the descri'ition which isto i'ollow. By e system of permutation, the apertures in the seloctilig hurs are arranged such that 32 possible eoinbiinitions muy be setupihrounh the operntion of either set/*ot selecting bers. Thus 'upon the depression of the character lie/ys. `the selecting,y bers will be set in different combinations to correspond with the Baudet or live-unit code. lf more combinzi tions ere desired, or' course, is necessary to increase the number of selecting bers,

-`li'orwitli, live A positive and negative select ing'diers, the' number of combinations limited to 52.` llithont-additional selecting' bars. the errengement of the apertures would) result in the movement of the select-- fing bnrs to the same position of two key levers which condition, of course, is not deaired;v i y Thetirst ivo of the selectin ,fr bers enumerated above are herein termed positive selecting' bers., iii/'hilo the other iii/e are termed negative selecting bers. i ll of the select e negative Aselecting! ber associated ther 1 messes which ere adopted to be engaged by n pivoted member 25 which is' clearlyshown in Fig. G. Each pivoted member 25 extends from e positive selecting bnr 'to it negative selecting bar and engugesthe lugs thereof. Thus, when e positive selectingr bnr is shift ed due to e depression of the character key,

with will be moved in the opposite direc tion or vice verse., due to the movement of the member 5. This thereby maintains the selecting bers 1n then' actuated position until the subsequent depression of another 'character key or the settingr up of :i difierent cmnbinfition.A ln order that these selecting: bers may lmove with ns smell amount of friction possible, 4there is provided a, set of rollers such as 31 and 252 whicltare supported by means of' brackets 29 and 30, these brackets being suitably screwed to die base portion ot the casing.

To the-upper edgeol' each orx the positive selecting bars, there is attached s contactcontrolling member 33. 'lhcse contact-controlling members control the vretention ol Contact springs 3l 21nd 2&5 suitably arranged therewith. i `l1u.s,`whe1'i one of the selecting bars is shifted, he contact-melting member 33 will likewise he shifted for etfooting the actuation of the contact springs 34 and 35.

The selecting bar Q2 which is common to :Ill the character keys and is shifted due to the depression ot' any one thereof, has mounted on its upper edge, a stepping pewl 36 which is adapted to impart a stepping movement to a starwheel 37.v This stur Wheel is associated with u Contact spring 38 which is adapted to engage another contact spring 39. The closure of these Contact' springs through the stepping of the stur Wheel 37 by means ot the stepping pewl l() completes an energizing' circuit tora an clertronniguet 4U. rlhis circuit muy be trau-cd from buttery ihrough the switch 4l, contact 42, contact springs 58 und 39 und the winding; of magnet 40 to ground. There is also n'iounted on the upper edge of the selecting' bar 22 e contact control member 69 for con-- trolling' the actuation of Contact springs To and 71. These Contact springs control the energizetion or" an electronuignet 64 when, the switch 4l is thrown so as to engage conf tact 46. The selecting bar 21 also has a siin` iler Contact controlling member mounted thereon, which, when shifted, closes contacts 78 and 79, and causes the energize'tion of en electromagnet 77, the purpose of which will be more clearly brought out in the description which is to follow. Whenever it is desired to record the characters of a message by ineens of perforetioi'is in fi tope, the switch il is thrown to engage loo serve as :1 guide therefor.

serves to'restore the ,erznature contact 46. The engagement of the switch 41 with contact ifi-completes a circuit including the winding of the electromagnet G l, and the contact springs 70 and 71, which will he actuated each time the selecting; bar 22 moved forward. The movement of th.. switch 4l so as to engage contact 46, opeinl the energizing circuit of magnet t() and prevents its operation upon the closure of con tacts 38 and 39, which will he closed upon each movement of the selecting har 22, ns previously described. I

"The tape perforating mechanism consists of the 'following parts: an extension 54, which rests on lugs formed in the housing 5, and through which pass a :number of churacter punch pins, 55, 56, 57, 59 and 60, and' a similar feed punch pin 58. This extension. together with the upper cover plate of tlc casing through which the punch pins pass The character punch pins have an eulaged portion or shoulder which rests upon the extensions .'34, the feed pin is also provided with an enlarged portion of the sume nature as that of the character pins. The punch pins pass through holes or openings in a member 6l, which is supported by means of uprights 23-23. Mounted on the hase of the housing is :1n electromegnet fill, having an armature 63 pivoted to extensions also seciued to the base' of the housing. There is attached to thev armature 63 a coiled spring El, which 63 to normal upon the' deenergization of the eiectromagnt 64:. The armature is .lL-shaped and -magnet 64, and the has a portion tlierect directly beneath the punch pins and serves .as ineens for driving the punch pins through the tape upon the energization o the electror eignet.

Each of the character pins has assoc-interi therewith e lever 50, the free end of which is adapted to be moved between the come spending-punch pin end the horizont@ portion of the armature 63. Thus, whene'gerthe clcctromagnet Si is energized, the ijniinch pins corresl'ionding to the levers 50, which nrc moved underneath the punch pins, will he moved into engagement with the tape 54 for performing the seine. The feed punch pin will however he driven through the tape upon erich energization of the electromagnet 64, as. it normally rests' on the horizontal portion of' the armature 63.

The uprighte 23e-23 are also mounted on the horizontal portion of the armature G3, so that the member 6l will he moved in an upward directcn upon. the energization of the electromagnet 64. When the current is disconnected from the Winding of electroarmaturc thereof is rcstored to normal hy means of the retractihx spring, the inemher 6l will he caused to engage the enlarged portion of the punch pins and thereby Withdraw them from engagement with the tape and allow them to again rest on the extension 5-1. This clin'.- iimtes thc use of springs und provini/.ls n more positive notion for restoring the punch pins to normal.

There is also attached to the armature U3, un upright incmher (Si which cni'rics n stepping pawl (5? under the contri4 ol retrattile spring (3,6. This stepping' pax-fl (37 is adapted to engage the tooth oit a tape advancingjr Wheel 68 for advancing the tape 45. The teeth of the wheel (3B engage the feed holes in the tape 45, which have heen cut h v the common punchpin 58. Thcpawl Gi' is thuzrctuatcd upon the attraction of the armature 33 for movingl the tape 45 to an unninchcd area, for the perlorating; of the tope in accordance with the new? succeeding character.

The free end of the levers 5() are prevented from getting out of place by means of n rod suitably supported hy a member 53 which is secured to ithe ezrtensicn 5l. Thev rod 52 hns attached thereto a coiled springr 5l. for maintaining the rod in ccntact `with the levers 50. litt the other end of the lovers 50, there comicctcd a linhr 48. This link is pivoted to an upright it), which is mounted on the hose oit the housing, and has nu extension thereon which is adapted to be en fngcd by. e hooir -t se cured at one end of the positive :-clcctin;T hars. Thus, when the selecting hars are actuated by the depression of n character key, the levers will likewise be moved through the movement o' the lilik ll.

ilu order that an operator, when usino' the keyboard mechanism either as n, direct transmitter or for the purpose ol perlorating e tene., may know exactly hon' man v characters have heen either transmitted rlirectly to line or stored in the i'ccoi medium, there in provided menus '-.\.lic'|^eoy the numhcr of characters which here heen selected may he readily determined. ',ihis consists of a notched nieruhci' 7:! Inouumi in the :iront portion of the kcyiimiril lunch unis-m' and which has attnchcil thereto, :t flexible syn-ing tor restoring the saine to normal upon its rele-asc. 'lherc is mounted to one end ci this member i2, a knol) Til which projects out through a, slot i5 cut in the member 7G. The member 76 has suitably marked thereon, e scale which enables the operator to determine how muni; characters have been selected, since the knol) ill is adapted to he moved nlong'this scale upon the selection of each character.' The ad\'ancerncnt of the member 72 is controlled hy the electrornagnet 77, the energizing circuit of which is completed through the contacts 7S and 7 9. These contacts are ada A ted to be closed upon the shifting of the selecting,y bar 2l. To the armature of the electro` magnet 77, there is attached e stepping,f

pawl 8O which engages the teeth on the lower edge of the member' 72 and advances the same upon each energizatio'n of the maguet 77. The member 72 is adapted to be held in its` actuated position by means of a holding pawl 81. It is thus seen that inasmuch as the electromagnet 77 is energized upon the depression of each of the Acharacter keys,xwith the Aexception of those which are for special functions, such as carriage return, ,line feed, ete., the member 7 will be advanced for indicating the number of characters which have been selected. 'When the operator, after having, selted lthe number of characters desired tov be printed' on a particular line, actuates the carriage return key, the member 72 will thereupon be restored to normal under the control of the spring 73. IThis is accomplished by providing a pin 82 on the lever of the carriage return key, so that when this key is depressed, the pin ,engages one end of a lever 83 and causes the same to be moved to a horizontal plane. Attached to the other end of the lever 83is a pivoted member 84, which is yso arranged that' when the lever-83 is moved, itengages a portion vof the holding pawl 81 for etiecting the dis-V engagement thereof with the teeth of the member 72.A The holding pawl 81, upon being Withdran n from engagement with the menber 72, removes the stepping 'pawl for preventing its, interference with the return of vthe member 72. The holding pawlSl is also held out of engagement with the teeth of the member 72 by meansof'a latch This is for the purpose of maintaining both the holding vpavvl 81 and the stepping pawl 8O out of engagement with the member 72, nntil'the subsequent ener gization of the magnet 77.

It is thought that a' more concise under standing o t' the invention may be had from a description of the selection of a particular combination when considered with particular reference to Figure 7. liet us assume that it is desired to employ the keyboard nuahauism as a direct transi'uitter, and with the. selection ol' the preceding character, the selecting barfl had been moved in a positive direaction?,forY etl'ectiug theY closure of Contact springs 86 and 87, and is thus retained in its actuated position. rlhe negative selecting bar 18, which is connected with the positive selecting bar 13,' will be moved in the opposite direction by thepivoted member` 25, common to both these selecting bars. Upon the depression of another character key such as, for instance, the key G, the positive selecting bar 11 will be moved in a positive direction and at the same time canse the negative'selecting bar 16 to be shifted in the opposite or negative direction by means of the pivoted membr 25. The

aperturcin the negative selecti g bar 18 is `depression of the so arranged with respect to key lever 7, that when tlle key 6 is depressed, it will be caused to move forward due to the engagementof operating lever d with the side 'of the aper' ture in this selecting,r bar. Accordingly, selecting bar 13 will be moved in the opposite direction by means of the member 25 associated with, both of these selecting bars. The remainder of these selecting 'bars vwill remain unatiected,-due to the actuation of this particularncharacter key, as the keylever i does 'not-engage the apertures eut therein. It is thus seen that the shifting of movement of the negative selecting bar 18,

which causes the positive selecting bar 13 to be moved in a negative direction. The selecting bar 22 will also be shifted upon athe character key 6, for causl ing the stepping pand-36 to advancevthe star Wheel 37 for closing contacts 38 and 39. A circuit is thuscompleted for the release magnet 40 in the same manner.` as previously described. The ,energization of the release i magnet-40 thereby attracts its armature and releases thefarm 43of the distributor 44, which conneets'with'the line 9()l the various contact springs controlled bythe selecting bars in the order in which they are -connected with the segments of the distributor. The' selecting bar 21 will also be shifted, upon the depression yof this character key, for effecting the energization of magnet 77, upon the closure of Contact springs'78 and 79. This, as before noted, advances the member 72 one step. lfollowing the move.- nu-ut of selecting bar 2l to the left and the restoration o't the actuated ("-haractcr key to normal this bar will -be restored by spring 21A. Likewise, when the selecting bar J2 is moved from its normal position and the actuated character key is restored to'noinal this bar will be returned by the action of retractile spring 22.

W'hen any one of the pressed tor the selection of particularfones key levers is deof the selecting bars in accordance with the desired character to be transmitted, the fuit depression otl a second key is prevented due to a mechanical connection established by. the operating levers of the character ke is engaging the sides -of the apertures in tie selecting bars and the connecting link 25 be.- tween vthe two sets of selecting bars. .As shown in Fig. 7, when the character key 1 is depressed, the corresponding operating lethat the sides of the apertures .ver3 is movedto the lett'thereloy moving the selecting hars ot' the respective groups so cut therein are aligned along the broken line A.-A. Upon the restoration of the key l to nor-mal, the selecting bars, with the exception of bars 2l and 22, remain in the position set. The latter mentioned bars are restored to their normal position by means of retractile springs 21A and 22A. Now, should an attempt be made to depress key 6 during the period that key 1 is depressed, no mutilation 1 of signals will result owing to the mechanical locking arranqement established between the respective' bars through the operating levers of the depressed Character ke);T and the connecting link 25. T/lhen an attempt is made to depress key 6, with key 1 already. depressed, no movement of the selecting bars will result even though the operating lever 4 of key 6 engages the sides of the apertures in selecting,r bars l1 and 18. These selecting bars With their corresponding .selecting hars lf3V and 13 are prevented from operating on account ot the depression of key 1' which already has its operating lever 3 in engagement with the sides of the apertures in the respective selecting bars arranged along the broken line Arof Fig. 7. When this condition exists, selectingr har 11 is prevented from moving for, as shown in Fig. 6 a projection on the under surface of this bar engages the pivoted connecting link 25 which extends to selecting bar 16 of the second set and which transmits the movement of the selecting bar 11 to selecting,T bar 16, and vice versa. Accordingly, with the selecting bars in the position shown in Fig., 7, selecting bar 11, upon the depression of key 6, is .moved to the left While selecting bar 1G moved to the right through 'the connecting link 25. owever, when the key 1 is depressed, the apertures of the selecting hars are aligned along the 'broken line -A of Fig. 7, selecting bar 16 cannot be moved clue to the engagement of the side of its aperture loy the operating lever 3 of key 1. Likewise, selecting har 18 is prevented from being shifted upon an attempted depression of key G. By the system ot permutation in accordance with the Baudet or Five-unit code,lthe` apertures in the selecting hars are all cut so that no tivo keys have the same cuttings. Consequently there will he at least one set ol selecting hars which will have the odge of iis aperture projecting,r beyond the line B-B at any other key duringr the period any key -ls depressed thereby preventing the depression of any of the other character keys.

Fowever, the instant the character key 1 is restored to normal, anyof the selectinga hars such as those brought about due to the depression of the character key G may he shifted to their selecting position. When vthe character key 6 is depressed, the apri turcs out in the selectingJ hars will he aligned along' the broken line l3-llin a manner similar to the alignment ot the apertures in the selecting hars along; the hroken line A-A oi Fig. i. Y i

'l`he operation of the mechanism when employed tor the purpose oit peroratingr a paper tape is substantially the same, with the exception et disconnectiunn the release magnet 40 and coniiecting the Winding of the magnet (il with. battery through to the (ontacts ot the switch llil-upon the closure of Contact springs and 71, and a Yfurther description thereof is considered unnecessary. f

What is claimed is:

l. ln a transmitter, the combination of a keyboard mechanism, character keys, operating levers therefor, a plurality of selecting bars arranged transversely ot' said operating" levers, and ineens comprisingr mechanism connected with ccrtaiu ones of said hars effective for preventini;- the simultu ncous depression of two of said character keys.

2. ln a device for setting up character representations in code form, a key-controlled mechanism, comprisin;l operatingr levers, a plurality of seis of .selecting ciw ments, and a member connectingr an element in one set with au element in the other srt and actuated upon the movement oi" either of the elements due tothe operation oi an operating: lever for shifting' the other element in the opposite directif'in.

E. ln a transmitter, the comhinatiilui of keyboard mechanism, a plurality of sclcch ing elements havin;y ,irrc ularly shaped apertures, operating; levers i sing through the apertures in said selecting; elements :uid hy the lateral movement of the operating levers engaging the Walls of such apertures 1For moving the sclectii'ip; elements in suhstantially the same plane.

4. A keyboard lmechanism comprising' a plurality'o" character keys. a plurality ci selecting' elements having apertures therein and an operating' lever individual to mich of said keys extending through such apertures, and hy their lateral moven'wut caufrf the movement of Said selecting clcrncnls iu various conhinations, said elementsl luv-irri arranged to remain iu the sci' position until subsequently moved duo (o thc actuation ot another operatingr lever.

A lmyl'aonrd uzcchuuisui comprising' a plurality ol1 character keys, :i plurality oi' selecting' clementev having irregularly shaped apertures therein. and an. opcratiiifr levr-r individual to each. ot said keys extending through such apertures, und hy their lateral movement cousine the movennent oi' said seleetine elements in various conilnnations, said clemente` heine" arranged to remain in the set position until euhsefpiently moved llO lue to the actuation of another operating lever. v

i (3. ln a (levice for setting up character representations in Code form, e key controllecl mechanism comprising a plurality oi" selectingr elements having apertures therein antl operating levers passing therethrough and by their lateral movement engaging the walls ot such apertures for effecting the movement of said elements in various combinations.

7. In n transmitter the eombination of si' group responsive i'o'the movement of an' element in the kother group.

9. A keyhouwl mechanismcomprising a plurality of clnuacter keys, operating' levers therefor. e plurality ot' Sets of selecting elements.; all ot' seul selecting elements being 'moved directly hy soirl operating levers, and

n member associated with an element of each set :incl responsive to the movement of' nn element in either one of said groups for effecting' the ino'\'.fnrient of the correspond in,gr element in the other group...

l0. rkeyl. .nl mechanism comprising a plurality et character keys, operating levers therefor, a set of 1positive and e. set of negative selectingr hars in operative relation with said operating levers and operat# ful rlirect-ly thereby in variable combinations upon the olepre'ssion'olE the corresponding character key.

11. A keyboard mechanism comprising a plurality of character keys, operating levers therefor, e set of positive anrl a set or' nega tive selectingT bars arranged to be shifted directly by said operating levers and a member individual to a selecting bar of each set and ee'tuutetl (lue to the n'ioven'ient of either one thercol toi' causing the nur` ornent oit' the other of saint selecting l2. A keyboard n'ieelianisin comprising n plurality of character keys,y operating levers therefor, a set of positive and e. set of nega.- tive selecting bars in operative relation. with said operating levers and operated clireetly thereby, :intl a member individuel to a. sc'- lecting har of enen` set and actuated tlue to the n'iovement oi either one thereoi for causing the movement of the other ,of Seid puir of selecting bars in an opposite direction.

1?. A transmitter comprising keys, a plu rnlity of sets of selecting elements, contacts associateiil with one of seid sets thereof, means for shift-ing en element of one set upon the movement of the corresponding element in the other set and means moved' laterally upon the depression or a key 'for effecting the movement ol the selecting elements in Avariable Acombinations for actuating; stahl contacts.

i4. A transmitter comprising keys a plurality of sets of selecting elements. conta-ets associated with one of siiitl Sets thereof, e mei'nher coopernting` with e selecting element in each of seid sets sind actuated tine to the movement of either one' or the other thereof for effecting the movement of the rorrespontling one in the otherset in an. opposite direction, and ineens responsive (lue to the depression of a key jor moving said selecting; elements in variable combinations tor actuating said contacts.

ll. 'ln a' transmitter, the combination et a keyboard mechanism, keys, operating' levers therefor, a plurality of selecting elements arranged transversely ott seit?` operating' levers, selecting elements having aper tures through which saicl operating' levers 1' ass,.sni l elements being arranged to be movetl in substantially the same plane sairl operating levers.y contacts controlled by seirl selecting1 elements, a line, e distributor having certain ot snitl contacts connected to the segment thereof, snel ineens operatedflne to the lepression eli a key for causing said distributor to connect seid contacts with said line ln Witness whereof, l hereunto subscribe my naine this '14th (lay or" July Jl. i920. 

